【摘要】 随着工业控制、车载网络等实时业务流开始向以太网迁移,网络设备需要提供低时延低抖动的QoS保障机制。传统网络采用分布式控制,QoS保障机制的引入,会增加转发设备复杂度,同时也面临可扩展性问题。软件定义网络SDN通过将控制与转发分离,极大的增加了网络灵活性和可扩展性。本文基于SDN架构,通过在控制层将带宽资源量化为时隙,实现带宽资源的预分配;通过在转发层按时隙进行整形调度,避免了多条数据流同时到达中间转发节点产生的网络拥塞排队;通过从时间维度划分双通道传输,采用主动队列管理算法,隔离了普通通道对QoS通道的影响。本文充分利用SDN集中控制优势,设计了基于SDN的网络传输QoS机制,可为普通业务流与实时业务流等网络数据流传输QoS机制设计提供支持。更多还原

【Abstract】 Ethernet is used in industrial control network and vehicle network gradually, network devices need to provide QoS guarantee mechanism with low delay and low jitter. Traditional network adopts distributed control mechanism. The introduction of QoS guarantee mechanism will increase the complexity of forwarding devices, but also face scalability problems. Software defined network(SDN) greatly increases the flexibility and scalability of the network by separating control and forwarding plane.Based on SDN architecture, we pre allocate bandwidth resources by quantifying the bandwidth into time slots in the control layer; by shaping scheduling according to time slots in the forwarding layer, we avoid the network congestion queue caused by multiple data streams arriving at the intermediate forwarding node at the same time; by dividing the dual channel transmission from the time dimension and adopting the active queue management algorithm, we isolate the impact of ordinary channels on the QoS channel.We take the advantage of SDN centralized control to design the network transmission QoS mechanism, which can support the design of network data flow transmission QoS mechanism such as ordinary traffic flow and real-time traffic flow.更多还原